Quizizz - Module 5 Revision 2

Which graph best shows the relationship between gravitational force and distance from the centre of a planet?

• A

• B

• C

• D

What is the gravitational force between two objects each of mass 40 kg, when they are 6 m apart?

• $1.78\times10^{-8}N$

• $2.96\times10^{-9}N$

• $4.45\times10^{-10}N$

• $7.41\times10^{-10}N$

The mass of Mars is 6.43 x 10^23 kg, and its diameter is 6794 km. What is the weight of a 5 kg object on Mars?

• 3.72 N

• 18.58 N

• 6.31 X 10^7 N

• 1.86 X 10^7 N

Two planets, X and Y have masses 4M and 9M and diameters 8R and 18R respectively. What is the ratio of their gravitational forces on their surfaces?

• 2: 9

• 4: 9

• 9: 4

• 16:81

A gravitational force of F newtons exists between two objects. What would be the new gravitational force between them if the mass of both objects and the distance between them was doubled?

• 8F

• 4F

• 2F

• F

An astronaut in orbit 6000 km above the Earth experiences a gravitational force of F. His spaceship moves to a 12 000 km orbit. What is the new gravitational force the astronaut experiences?

• 0.25F

• 0.44F

• 0.5F

• 2.25F

Consider the two planets, X and Y shown:

The gravitational force on X due to Y is F. What is the gravitational force on Y due to X?

• 0.25F

• 0.5F

• F

• 4.0F

A satellite in orbit around Earth, of mass 500 kg is raised from an orbital radius of 7.3 x 106 m to a geostationary orbit of orbital radius 4.2 x 107 m. What is the change in its gravitational potential energy?

• +3641.5 J

• -3641.5 J

• +2.26 X 10^10 J

• -2.26 X 10^10 J

The gravitational potential energy between two objects is E. The distance between the objects is halved. How much work was done in moving the objects closer together?

• 0.5E

• 1.0E

• 2.0E

• 4.0E

What is the relationship between the work done on an object and its gravitational potential energy?

• The work done on the object equals the increase in its gravitational potential energy.

• The work done on the object equals the decrease in its gravitational potential energy.

• The work done on the object equals its gravitational potential energy.

• The work done on the object equals the change in its gravitational potential energy.